Match Column I with Column II and choose the correct option : Column I Column II a. Osmotic pressure i. $\Delta T_{\text{f}} = K_{\text{f}}m$ b. Elevation of boiling point ii. $\pi = CRT$ c. Depression of freezing point iii. $\frac{P_1^0 - P_1}{P_1^0} = \frac{W_2 \times M_1}{M_2 \times W_1}$ d. Relative lowering of vapour pressure iv. $\Delta T_{\text{b}} = K_{\text{b}}m$ Options : (A) a-i, b-ii, c-iii, d-iv (B) a-ii, b-i, c-iii, d-iv (C) a-iv, b-iii, c-ii, d-i (D) a-ii, b-iv, c-i, d-iii